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<H1>keys(+Tree, -KeyList)</H1>
Return all the keys from a tree.
<DL>
<DT><EM>Tree</EM></DT>
<DD>A 2-3-4 tree
</DD>
<DT><EM>KeyList</EM></DT>
<DD>A list of all the keys from Tree
</DD>
</DL>
<H2>Description</H2>
	<P>
	KeyList is a list of all the keys appearing in the tree Tree.
	</P>
	<P>
	This predicate should only be called with trees created by other
	predicates from the tree234 module.
	</P>
	
<H3>Fail Conditions</H3>
Never fails.
<H3>Resatisfiable</H3>
no
<H2>See Also</H2>
<A HREF="../../lib_public/m_tree234/values-2.html">values / 2</A>
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